<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>v-model</title>
    <script src="js/vuejs-2.5.16.js"></script>
</head>
<body>
<div id="app">
    <form action="" method="post">
        用户名:<input type="text" name="username" v-model="user.username"><br/>
        密码:<input type="text" name="password" v-model="user.password"><br/>
    </form>
</div>
</body>
<script>
    new Vue({
        el:"#app",
        data:{
            user:{
                username:"test",
                password:"1234"
            }
        }
    });
</script>
</html>